Glad I found this thread. I too am having delt problems. While my sides and rears are fine, my front delts are lagging. I do delts first in the week to ensure freshness (and delts are the only muscle group I train twice per week. My workout is any of the following:
seated db press, bent db laterals, very wide uprights, side laterals, machine press; OR
bb seated military press, reverse pec flyes (rears), front raises (either e-z bar or dbs), side laterals, wide uprights; OR
some variation, where I do 2 free weight press movements, or a free weight and machine press movement (no front isolation on days where I do two pressing movements). I sometimes do Arnolds. I never do the exact workout twice. I susbstitute cables or machines for iso movements at times. Reps are typically 8 -12 but I can go as low as 6 on compund movements and often do drop sets on the pressing movements (beats a crappy spot).
I even started doing bench presses regularly on chest days. I narrowed the grip to a little wider than shoulder width because some experts say bench presses strongly hit the front delts. And I do feel them in my front delts the next day.
Finally, there is always at least one day of rest between delts and any other upper body training.
Some have told me that because I was a competitive martial artist for years (although I stopped doing it like 10 years ago) all that training has made my shoulders immune to normal weightlifting response. Advice would be greatly appreciated...
If your shoulders can handle it, behind the neck presses worked wonders for me. Also, every workout I throw in rear delt work.
Think training's hard,. try losing!